Safety strain disk insulator.



L STEINBER'GER.

SAFETY STRAIN DISK INS ULATORf APPLIC'ATION HLEDJULYZS. 179 12.

WITNESSES Z; W03

Pateflmd Nov. 28, 1916.

LOUIS STEINBERGER, OF NEW YORK, N. Y.

SAFETY STRAIN DISK INSULATDR.

Specification of Letters Patent.

Fatented Nov. 28,

I Application filed July 25, 1912. Serial No. 711,467.

To all whomit may concern:

Be it known that I, LOUIS STEINBERGER. res1d1ng at Brooklyn, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Safety Strain Disk Insulators, of

- which the following is a specification.

' This invention relates to an insulator of the safety strain type adapted for use in general electric work, and more particularlyfor service where high voltages are present, and in instances where the insu' lator is subjected to a great mechanical strain, and it comprises a pair of metallic disks arranged substantially concentric with each other and spaced apart by an insulating .material, and said disks having strain members attached thereto in such manner as to tend to force said disks toward each other against the intervening insulating material, in resisting the mechanical stresses to which the insulator is subjected.

. Among the several objects of the invention, are: i

I. To provide the metallic disks each with an elongated opening through the material thereof extending from a point adjacent one marginal edge of the disk to a corresponding point at the relatively opposite marginal edge of the disk, and to form said opening of a reduced width intermediate its length so as to leave relatively heavy portions of the material of the disk intact for the tachment of the strain members, and to arrange the two disks in the finished structure, so that the elongated openings stand in right-angular relation in order that the two legs of the U-shaped strain member, which legs are attached to the relatively heavy portion of one disk, may extend through the relatively large portions of the opening of the other disk and be insulated therefrom by the main body of insulating material, and so that the peripheral edge portion of each disk is maintained intact and continuous to rigidly connect the relatively heavy portions at opposite sides of the openings in the disk and serve effectually to-oppose the strains applied to the disks by the strain members v in the relatively heavy portions and retained against relative longitudinal move ment by shoulders at one side of the disk drawn into close clamping relation with said. disk by suitable adjustable means at the opposite side of the disk.

Other objects and aims of the invention, more or less broad than those stated above, will be in part obvious and in part specifically referred to in the course of the following description of the elements, combinations, arrangements of parts and applications of principles constituting the invention; and the scope of protection contemplated will be indicated in the appended claim. a

In the accompanying drawings in which I have illustrated a merely preferred form of embodiment of the invention, and which are to be. taken as a part of this specification, Figure 1 is a longitudinal, central, sectional view, partly in elevation, through an insuconstructed in accordance with this invention; said section being taken substantially on the plane of line 1 l of Fig. :2; F 72 is a transverse, sectional view taken substantially on the plane of line 22 of 1, parts being shown in full lines; Fig. is a detail, perspective view of one of the disks; and Fig. iis a detail, perspective view of one of the strain members.

In insulators of this class, as heretofore constructed, the strain members have usually lad no rigid connection with the metallic isks such as would prevent the disks from aving movement relatively to the strain nembers until after the parts are assembled in tne finished structure, and I have observed that this condition has led to considerable inaccuracy and consequent waste and expense especially in the assembling of the device. It has been very difiicult, if not practically impossible, to maintain the disks, with uniform accuracy, in their proper relation to the strain members to which they are directly connected, and to maintain said disks and strain members in proper relative positions while the parts are being molded within the fictile insulating material which serves to bind them together. Ofttimes, edorts to maintain the disks in proper relation to the strain members result in anonparallel relation of the opposing surfaces of the disks, as often, leg, or portion of the strain inenibe may brought into physical contact with he and Einstein the shouloers 6, and

the parts inadvertently movement, while the other structure.

against fur leg of strain member is actually spaced away V the disk. Thus, when the enveloping material is molded about the metal" the spaced portion oi he st mains spaced until the device to a considerable st" on where way and fractures or ct I have provided herein. iple and ficient means whereby the eisk and strain members may be readily co together, and have so shaped the disks that they may be formed with apertures adapted the strain members without o necte l to receive tracting from the effective strength or disks in resisting strains imparted t from the strain members, the connectic ing rigid so as to efiectually prevent bending of the disl-z under excessive strains.

Referring to the drawings, 1 indicates the strain members, which are of U-shap l ing the opposite legs 2 and preterably con nected intermediate their length by areinforcing spacing bridge 4, and having their end portions threaded to receive nuts 5. and having annular shoulders at points spaced from the extreme end thereof. Each of the strain members i preferably identical in size and shape. Th disks, as 7, are also preferably identical in size and shape, and each is formed with an opening 8 extending entirely through the material thereof and from a point adjacent the marginal edge at one side of the disk a corresponding point at the opposite side of the disk. The opposite end portions of the opening are preferably rounded so that the maximum width of the opening is at a point spaced somewhat from its opposite ends, and the intermediate portion or the opening is of a somewhat reduced width so as to leave considerable portions 9 of the disk not cut away. The portions 9 are formed with apertures 10 spaced from the walls ofthe reduced portion of the opening 8. and adapted to receive those portions of the strain members between the shoulders 6 and the, extreme ends of the legs of the strain members.

In assembling the parts, the end portions of the legs of the strain members are inserted in the apertures 10 so that the shoulders 6 engage the surface of the disk. Conn-- tersinks, 11 are providedfor partly receiving thus avoiding unnecessary'sharp corners. The nuts 5 are then placed upon the-projecting ends 01 the legs and serve as adjustable clamping members for forcing the shoulders 6 into close clamp- -members. Obvio'usly, posits. strain members, with their disks in in assembling the op sulating material v other, prior body mabe rigidly shove det-nrough the econd disk iig 8 telerststrain the sec member throu h the aper- L 1 Q 1 1 eur's 10 or LllG second (rlSK, and placing the e clamping nutsposition. clamping members are then held in spaced relation and so that the opposite legs of the d through the opening 8 of the such or as to be spaced concenti :ally from the walls i said i insnlat liv I) material is then in any desirable shown m the l-r having its edgelornied .vu. I corrugations as 13 for increasing the suriace distance around said body material "from strain member to er.

ne connections hetwoen the legs of the strain members and the disks are designed to be absolutely rigid in practice so as to lend the strength of the legs iii-preventing tendency of the two halves of the disk to bend in vicinity of the reiat'vciy thin. connecting portions at opposite ends of the openings 8. it is thus made possible to form these connecting portions quite thin and weakso as to give a maximum size the opening 8 for enabling a comparatively greater bulk of inhetween the strain me hers passing through the opening 8 and'the walls of said opening were the connecting portions required to be thicker. and stronger. Pull of the strain members is principally resisted by portions of the disks lying at the sine of thepoint of connection of the strain members-with the disks away from the openings 8 so that there is obviously a tendency for the halves of the disk to hend a 3011i) an axis parallel;

with the length of theopening 8 extending through the point or" connection between the disks and the strain members which tend: ency would be resisted only by the thin portions connecting the halves of the ends of the opening were it not for the absolutely rigid co? iection provided bctween the strain members and the disks.

As many changes could be made in this construction without departing from the scope of the following claim, it is intended that ii matter contained in the above doscri i or shc :1': in the accompanying drawing shall interpreted as illustrative only and not in a sense.

the other ieaded ends of The opposite The envelop noted, comprises lull would be possible the disks at lli Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

vIn a strain insulator, a disk shaped member having an opening therethrough, said opening being of-a length so as to leave a 'comparativelysmall amount of the material of said member between the opposite ends of the opening and the outer marginal edge of said member, and being of a Width so as, to leave a 'comparatlvely great amount of material of said member between the opposite sides of the opening and the outer marginal edge of'said member, the relatively great amount of ,material at opposite sides of said opening being each formed. with an aperture therethrough, a U-shaped strain member having its legs extended through and beyond said apertures, shoulders formed upon the legs of said'U-shaped strain member engaging one surface of said disk shaped said line. I In testimony whereof, I affix my signature member, nuts carried by the projecting portions of said legs and engaging the opposite surfaces of said disk-shaped member to clamp said disk-shaped. member rigidly the opening in said disk shaped member andv intersecting the central axis of said aperture W1] l define surface extents at one SldB of the longitudinal central axis of. the. opening in said disk shaped member of substantially equal proportion at opposite sides of in the presence oftwo Witnesses.

YVitnesses:

NATHALIE THOMPSON, L. GERSFORD HANDY.

LOUIS STEINB-ERGER. 

